Energy Flow in Ecosystems

A ___ is an animal that only eats plants.

A ___ is an animal that only eats other animals.

• herbivore, carnivore

• carnivore, herbivore

• omnivore, detritivore

• detritivore, omnivore

In this food web, a ___ is a primary consumer and a ___ is a secondary consumer.

• deer, eagle

• grasshopper, mouse

• mouse, snake

• tree, grasshopper

In this food web, how many different organisms feed on the producer?

• 1

• 2

• 3

• 4

Organisms that make their own food are called ___.

Organisms that eat other organisms to gain energy are called ___.

• carnivores, herbivores

• heterotrophs, autotrophs

• autotrophs, heterotrophs

• herbivores, carnivores

If the bird population DECREASED, which populations would INCREASE as a result?

• bees and deer

• bees and grasshoppers

• snakes and hawks

• grasshoppers and rabbits

When energy is passed in an ecosystem from one trophic level to the next, only ___ percent of the energy will be passed on.

• 1000

• 100

• 1

• 10

When a population nears its carrying capacity, resources become limited. Population growth slows and ______.

• the death rate and birth rate increase

• deaths outnumber births

• the birth rate increases at a fast rate

• the birth rate and death rate are equal

A ___ is an organism that makes its own food.

A ___ is an organism that eats other organisms to gain energy.

A ___ is an organism that breaks down dead organisms to gain energy.

• producer, consumer, decomposer

• producer, decomposer, consumer

• consumer, producer, decomposer

• decomposer, producer, consumer

_________ is the largest number of individuals of a population that an environment can support.

• carrying capacity

• limiting factor

• biodiversity

• biotic factor

Which is an apex predator in this food web? (Hint: pay close attention to the arrows!)

• squid

• penguin

• seal

• krill